Here is how I think of it (could be wrong, could be too simple).

Traditional computers give information in binary. Example; It is either this or it is not this. It is either on or it is not on.

Quantum computers provide a spectrum answer; it is on, it is not on, it is somewhat on, it is off.

Some computational problems (the things computers solve at their root level) are fine with binary math and don’t benefit from what quantum offers. Counting problems for example. Some computational problems, particularly ones that require advanced math will benefit from computational capabilities of a quantum computer.

Hope this helps.

This answer by the way is right, kind of right and wrong all at the same time. QUANTUM!